To prevent temperature rise of a battery when short circuit occurs on the battery, and to improve safety of the battery.

The battery includes a battery case having an upper opening, a group of electrodes, an electrolyte, and a sealing plate for covering the upper opening of the battery case storing the group of electrodes and the electrolyte. The group of electrodes includes a first electrode, a second electrode, and a separator intervened between both electrodes, the first electrode and the sealing plate are connected with a first lead, and the second battery and a predetermined surface of the second battery are connected with a second lead. The second lead includes a bending section arranged along a curved surface adjacent to the predetermined surface, and the bending section is brought into contact with the curved surface.